Board Thread:Off Topic/@comment-31658174-20170620034623/@comment-27535813-20170622072247

Dragon Types can be countered/checked not just by Diancie, and this post shouldn't be in the Off Topic board, but in Pokemon Help board. You should state whether this team is for adventure or PVP use.

Robe is specifically talking about moveset fitting for PVP.  Like how Lucario can better sweep with Aura Sphere when running a moveset focused on his special attack stat. Drought is an ability that causes the Harsh Sunlight weather condition, which benefits Mega Charizard-Y in many ways. Rapid Spin/Defog support refers to removing entry hazards(stealth rock, spikes, toxic spikes, sticky web) which hurts the longevity(survival/health) of a pokemon entering a battle. Lopunny is a physical attacker, so thunder-bolt won't do much with it's middling special attack stat. Fake out also has a priority of +1, meaning it move first before most moves and helps to flinch the opponent upon the first turn Lopunny enters the battle.